Conquest of the Horde

This may seem like a very stupid problem but ..

I have found myself wanting to log onto my old retail account to check it out. But I do not want to leave CotH.
So, how do I copy my wow folder so that I can play two versions, patching one up to retail leaving the other one set to CotH?

Copy your current wow directory

C:\Program Files\World of Warcraft\ into another directory calling it

C:\Program Files\Retail\World of Warcraft\

in the retail folder delete your Cache folder, and lastly change your realmlist.wtf in your
C:\Program Files\Retail\World of Warcraft\Data\enUS to read

set realmlist us.logon.worldofwarcraft.com
set patchlist us.version.worldofwarcraft.com
set realmlistbn ""
set portal us

After that run your wow.exe in your retail folder and it will patch that version of Wow only. Currently I run both builds retail and CotH.